Self-locking seal.



E. TYDEN.

SELF, LOCKING SEAL.

APPLICATION FILED APR.14. 1915.

1 182 827. Patented Dec. 7, 1915.

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EMIL TYDEN, or nvans'ron, ILLIivoIs.

SELF-LOCKING SEAL.

Application filed April 14, 1915.

To all whom it may concern:

Be it known that I, EMIL TYDEN, a citizen of the United States, and resident of Evanston, in the county of Cook and State of Illinois, have invented new and useful Improvements in Self-Locking Seals, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

The purpose of this invention is to pr0- vide an improved form of self-locking seal.

of the general character of the seal shown in my Patent No. 739,037, September 15th, 1903, but designed to overcome a certain ground of criticism to which that form of seal is liable.

In the drawings: Figure 1 is a side elevation of a seal embodying this invention at unlocked position of the strap. Fig. 2 is a section at the line, 22, on Fig. 3, with the strap at locked position. Fig. 3 is a section at the line 3-3 on Fig. 1.

In the structure shown in the drawings there is a shell. composed of two members of sheet metal, A, A clenched together, engaging a diaphragm, B, and a sheath, G which is formed by folding upon itself the end portion of the strap, C, which constitutes the means by which the seal is engaged with the lock or device which it is to protect. it will be understood that the strap is formed with a wide portion at one end adapted to be thus folded to form the sheath.

D, is a wire coil which is lodged within the shell, spread open and held open by the two sides of the sheath so as to permit the free end of the strap to be inserted through the sheath, but adapted to be sprung oif from the sheath and become engaged to the aperture, 0, in said inserted end of the strap, thereby eflecting the securement of the seal. Said inserted end of the strap is beveled as shown at C to adapt it to trip the coil off from the sheath and into engagement with said aperture of the strap.

T he structure thus far described is the familiar one of the Tyden seal, substantially as shown in said Patent No. 739,038, and in my Patent No. 788,384, (the diaphragm mentioned not being shown in the first mentioned patent). In my said former patents the sheath is extended full width through the sheik-that is, it protrudes at Specification of Letters Patent.

PatentedDee. t, 1915-.

Serial No. 21,230.

the farther end from the side of the shell of thesame width as at the side at which the strap end is inserted for sealing, and therefore the aperture in said farther wall of the shell is of the full width of said sheath. Inasmuch as the end of the strap is beveled ofi' for tripping the engaging coil for locking, and it is the beveled end which protrudes beyond the farther wall of this shell within the protruding portion of the sheath, there is afforded a small crevice at the beveled end of the strap by reason of the width of the aperture and of the sheath being greater than the width of said strap at its beveled-and thereby reducedend portion. Through this crevice it is said that it is possible to insert a very small but strong steel wire hook, by means of which the spring coil device which engages the strap for sealing may be seized hold of and pulled out through the crevice, the wire coil of course being straightened out and the spring device mutilated in the process, but with the effect of releasing the strap so that the seal may be disengaged from that which it secures. To obviate this difficulty, in the structure shown in the drawings the end of the sheath which protrudes at the side of the shell opposite that at which the end of the strap is inserted for sealing is cut back inwidth to the width of the beveled end of the strap at the point at which it occupies the aperture in the shell wall when at locked position, thus forming on the sheath a shoulder, 0 which is stopped inside the wall of the shell, the aperture through that wall of the shell being similarly reduced in extent so as only to permit the reduced end of the sheath and the beveled end of the strap to pass through it. By this expedient access heretofore sometimes obtained for withdrawing the wire coil is prevented.

I claim:

In combination with the shell, the folded sheath extending therethrough; the strap continuous from one fold of the sheath at one end thereof adapted to have its free end inserted through the sheath and through the shell; the wire coil in the shell for engaging the strap; the end of the strap being beveled ofl at one edge for tripping the wire coil, and adapted to protrude its beveled end beyond the shell when at locked position,

the shell having the aperture at the side at which the strap thus protrudes limited in my hand at Chicago, Illinois, this 3d (lay Width substantially to the Width'necessary of April, 1915. to accommodate the strap at said protruding 7 beveled-end portion, the sheath being simi- EMIL T1 5 larly reduced in Width at that end, forming Witnesses:

a shoulder which is stopped Within the shell. CHAS. S. BURTON, In testimony whereof, I have hereunto set LUCY I. STONE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

